We're tired of having our dog pull us around the block on our walks. What can we do?
Use a working collar. Choose a chain collar -- called a training or choke collar -- or a head halter or Gentle Lead when training your pup. Used incorrectly, these collars may choke a dog, though this is not their intent. Use these only on puppies more than 10 weeks old.
When the dog pulls ahead, just stop. The dog must also stop. Now call the pup to your side by saying "close." When the dog heels, either offer a treat or a favorite toy. Then turn in the opposite direction. Go where you want to go, and make sure that place is opposite the direction the dog chooses. In other words, if your pup begins to turn right, quickly follow the procedure described above (stop, instruct the dog to move close and present a reward) and then turn left.
By the way, the reward of being with you must be more interesting than the ecstasy of sniffing grass. That's why the treat and/or toy are recommended. However, in time, both of those tools will be supplanted by vocal praise.
To encourage success, begin the work out indoors before moving outside on a busy sidewalk. Exercise the pup before work. Otherwise a puppy may be trying really hard, but might have a tough time controlling built-up energy.